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<h1><a name="SECTION0028000000000000000000"></a><a name="python"></a>
<br>
26. Python Runtime Services
         
</h1>

<p>
The modules described in this chapter provide a wide range of services
related to the Python interpreter and its interaction with its
environment.  Here's an overview:

<p>
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      <td><b><tt class='module'><a href='module-sys.html'>sys</a></tt></b></td>
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      <td class='synopsis'>Access system-specific parameters and functions.</td></tr>
  <tr><td><b><tt class='module'><a href='module-builtin.html'>__builtin__</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>The module that provides the built-in namespace.</td></tr>
  <tr class='oddrow'>
      <td><b><tt class='module'><a href='module-main.html'>__main__</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>The environment where the top-level script is run.</td></tr>
  <tr><td><b><tt class='module'><a href='module-warnings.html'>warnings</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Issue warning messages and control their disposition.</td></tr>
  <tr class='oddrow'>
      <td><b><tt class='module'><a href='module-contextlib.html'>contextlib</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Utilities for <tt class="keyword">with</tt>-statement contexts.</td></tr>
  <tr><td><b><tt class='module'><a href='module-atexit.html'>atexit</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Register and execute cleanup functions.</td></tr>
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      <td><b><tt class='module'><a href='module-traceback.html'>traceback</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Print or retrieve a stack traceback.</td></tr>
  <tr><td><b><tt class='module'><a href='module-future.html'>__future__</a></tt></b></td>
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      <td class='synopsis'>Future statement definitions</td></tr>
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      <td><b><tt class='module'><a href='module-gc.html'>gc</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Interface to the cycle-detecting garbage collector.</td></tr>
  <tr><td><b><tt class='module'><a href='module-inspect.html'>inspect</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>Extract information and source code from live objects.</td></tr>
  <tr class='oddrow'>
      <td><b><tt class='module'><a href='module-site.html'>site</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>A standard way to reference site-specific modules.</td></tr>
  <tr><td><b><tt class='module'><a href='module-user.html'>user</a></tt></b></td>
      <td>&nbsp;</td>
      <td class='synopsis'>A standard way to reference user-specific modules.</td></tr>
  <tr class='oddrow'>
      <td><b><tt class='module'><a href='module-fpectl.html'>fpectl</a></tt></b></td>
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      <td class='synopsis'>Provide control for floating point exception handling.</td></tr>
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<span class="release-info">Release 2.5.1, documentation updated on 18th April, 2007.</span>
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